Seating structure



March 23, 1955 H. D. CHAPMAN ETAL 3,174,795

SEATING STRUCTURE 2 Sheets-Sheet 1 Filed Oct. l1, 1965 HOW/1 @D QCHAPMAN #EA/RVG. BAA/KE Agg March 23, 1965 H. D. CHAPMAN ETAL 3,174,795

SEATING STRUCTURE Filed oct. 11, 1965 2 Sheets-Sheet 2 United StatesPatent O 3,174,795 SEATING STRUCTURE Howard D. Chapman, Highland Park,and Henry C. Bauke, Chicago, Ill., assignors to Clarin Mfg. Co.,Chicago, Ill., a corporation of Illinois Filed Oct. 11, 1963, Ser. No.315,483 11 Claims. (Cl. 297-160) This invention relates to seatingunits. More particularly, the invention relates to seating units whichinclude an arm assembly.

The principal object of the present invention is to provide an improvedseating structure including a detachable arm assembly.

An additional object of the invention is to provide a seatingarrangement which includes an aligned row of two or more seating unitsreleasably interconnected by a detachable arm assembly supportedintermediate adjacent units.

A further object of the invention is to provide an arm assembly adaptedto be supported intermediate a pair of adjacent seating units andcapable of interconnecting the units to each other to form an alignedrow.

A still further object of the invention is to provide seating unitsadapted to be interconnected with one another in an aligned row and tohave an arm assembly releasably attached thereto.

Another object of the invention is to provide an improved seatingstructure which includes a detachable tablet arm assembly.

A related object of the invention is to provide a tablet arm assemblywhich is adapted to be detachably mounted on a seating unit.

Other objects and advantages of the invention will become apparent withreference to the following description and the accompanying drawings.

In the drawings:

FIGURE l is 'a front elevational view of a seating arrangement showingvarious of the features of the invention;

FIGURE 2 is an enlarged fragmentary sectional plan view taken along line2 2 of FIGURE l;

FIGURE 3 is an enlarged front elevational view of the tablet armassembly which forms part of the seating arrangement shown in FIGURE l;

FIGURE 4 is an exploded fragmentary sectional view of the structureshown in FIGURE 2;

FIGURE 5 is a perspective elevational view of a seat-` ing structureshowing various of the features of the invention;

FIGURE 6 is a fragmentary partially broken away plan view of a portionof the seating unit shown in FIG- URE 5;

FIGURE 7 is a fragmentary enlarged side elevational view of the seatingunit shown in FIGURE 5;

FIGURE 8 is an enlarged fragmentary sectional elevational view takenalong line 8 8 of FIGURE 6; and

FIGURE 9 is an enlarged sectional elevational view taken along line 9 9of FIGURE 8.

Very generally, the illustrated embodiment of the present inventioncomprises an arm assembly 11 which is adapted to be detachably mountedon either or both sides of an individual seating unit 13, and which canbe supported intermediate and detachably mounted on each of a pair ofadjacent seating units so as to interconnect the units in an alignedrow.

The seating unit 13 is in the form of a chair similar to that shown inU.S. Patent No. 3,084,977 and includes a body-receiving shell 14supported by a pair of depending leg members 15 adjacent each ofopposite sides thereof. A bracket 17 is secured to one of the pair ofleg members 15, and a mating bracket 19 is secured to the "lee oppositepair. As set forth in the above-mentioned patent, these brackets areformed so as to be capable of being placed in releasable interlockingengagement with each other. Hence, when two such chairs, facing in thesame direction, are arranged in side-by-side relation, they can bereleasably interconnected or ganged in an aligned row.

The arm assembly 11 includes a standard 21 provided at its upper endwith a generally horizontally disposed member which, in the illustratedembodiment, is in the form of a tablet arm 23 but which may assume anyof various other forms, such as a conventional arm rest, if desired. Thestandard 21 is provided on one side with a bracket 25 similar to thebracket 19 of the seating unit 13 and capable of being placed inreleasable interlocking engagement with the bracket 17 of the seatingunit 13, thereby facilitating detachable mounting of the arm assembly tothe seating unit in a manner which renders the tablet arm 23 suitablefor use by an occupant of the seating unit. In addition, the standard 21is provided with a bracket 27 on its opposite side, which bracket issimilar to the bracket 17 of the seating unit 13 and is capable ofreleasable interlocking engagement with the bracket 19 of the seatingunit. Accordingly, the tablet arm may be disposed intermediate, anddetachably mounted on, each of a pair of like seating units arranged inside-by-side relation, thereby releasably interconnecting the seatingunits with one another in an aligned row.

More specifically, the bodyesupporting shell 14 is preferably molded,las from a ber reinforced resin, anddefines a seat 29 and a backrest 31,each of which may be padded as at 33 if desired. The shell 14 isattached to and supported by the leg members 15 which are defined byoutwardly extending end portions of a pair of generally U-shaped tubularmembers 35 and 37, which members also dene intermediate bight portions41, referred to in greater detail shortly. The leg members 15 aretapered toward their outer ends to provide a more graceful and pleasingappearance for the chair, and each of the outer ends has detachablyaixed thereto a foot 43 in the form of a universally mounted pad orbutton constructed to permit swivelling movement of the pad relative tothe leg member to thereby ensure full supporting engagement between thepad and the supporting surface.

The bight portions 41 of the Urshaped tubular members 35 and 37 are bentin an arcuate shape (FIGS; 5 and 6) and have a pair of horizontallyspaced elongated metallic trips 45, one of which is shown in FIGURES '6and 7, secured, as by welding or the like, to their upper surfaces. Eachof the strips 4S is adapted to be detachably secured to theunder-surface of the vseat 29 of the shell 14 and includes an upwardlyoffset ange portion 47 (FIG. 7) provided with a hole 49 at its forwardend to receive a suitable fastener (not shown). An elongated slot 51 isprovided in each of the strips 45 in rearwardly spaced relation to theforward ends thereof to accommodate a second fastener (not shown). Thelbrackets 17 and 19, previously referred to, render the chair 13 adaptedfor releasable interconnection with a-n adjacent chair and, in addition,render the chair suitable for the releasable attachment thereto of` thearm assembly 11. In addition, the'particular form of brackets shown inthe illustrated embodiment serve to interconnect and brace the legmembers 15 adjacent each side of the chair.

More specifically, the bracket 17 is preferably secured to the legs 15adjacent the right side of the chair and is in the form of atrapezoidally-shaped open frame defined by generally parallel upper 4andlower cross members 53 and 55 respectively interconnected by a pair ofup'- wardly converging intermediate-sections 57. Each of s theintermediate sections includes outwardly projecting curved side flangeportions 59 which are secured, as by welding, to the outer side surfacesof the leg members on the right hand side of the chair. The inner edgeportions of the intermediate sections of the bracket are formed toprovide oppositely facing lchannel sections 61 which are open toward thefront and rear respectively of the chair and define upwardly converginggrooves 63 adapted to receive complementary portions of either thebracket 19 or the bracket 25, soon to be describe-d.

The bracket 19 is iixed tothe opposite, or left hand, side of the chair1-3 and, like the bracket 17, is in the form of a trapezoidally shapedopen trame defined by generally parallel upper and lower cross members65 .and 67 joined by upwardly converging intermediate sections 69 andsecured to the leg members 15 by `curved flanges 17.' However, whereasthe intermediate sections 57 of the bracket 17 are formed to provideoppositely facing channel sections 61 defining grooves 63, theintermediate sections of the bracket 19 are formed to provide a pair ofinwardly facing tongues 71 which are offset outwardly of` the main planeof the bracket and are -arranged 41n upwardly converging relation toeach other. The tongues 7-1 of the bracket 19 and the channels 61 of thebracket 17 are dimensioned and disposed with respect to each other suchthat the tongues 71 can be slidably received into the grooves 63 whenthe bracket l19 is rnoved downwardly with respect to the bracket 17.

' IIt will be noted in FIGURE 2 that each of the channels 61 and tongues71 of the brackets 17 and `19 respectively define horizontally spaced,generally vertically disposed surfaces which engage one another andprevent lateral movement of the brackets relative to one another whenthe brackets are placed in interlocking engagement. Moreover, theconverging con-figuration ot the 'channels and tongues causes them todene upwardly and downwardly directed interengagiug surfacesrespectively which limit vertical downward movement of the bracket 19relative to the bracket 17 These features are particularly advantageouswith respect to the arm assembly 11, as will become apparent shortly.

' To provide for ver-tical stacking of the chairs, a stud 73 projectsoutwardly from each of the leg members 15 immediately above each of thebrackets 1-'7 and 19 and is engaged by the lower edge of a correspondingbracket oi a stacked overlying chair. A recess 75 -is formed in thelower edge of each of the lower cross members 55 and 67 of each of thebrackets 17 and `19 to receive the studs of an underlying chair.

v Refierring now to the arm assembly 11, .the standard V21 thereof(FIGS. 3, 5 and 7) is defined by a pair of upright, horizontally-spacedforwardly and rearwardly disposed Vtubular members 77 and 79respectively interconnected at approximately their vertical midpoints bya horizontally extending pin 81. The pin 81 also passes through one endof a brace 83, soon to be described, which is positioned intermediatethe members and is adapted for pivotal movement about the pin. A cap 85is secured to the outer surface of the standard to conceal the open endof the brace.

The tubular members 77 and 79 are bent so as to diverge relative to oneanother both above 4and below the pin 81, thereby defining a generallyX-shaped configuration. The upper ends of the forwardly and rearwardlydisposed tubular members 77 and 79 are offset forwardly and rearwardlyrespectively to provide generally horizontally disposed portions 87 and89 to which the tablet arm 23 is pivotally secured, as hereinafterdescribed;

The lower end of the standard is provided on opposite sides with thebrackets 25 and 27 which are adapted tor interlocking engagement withthe brackets 17 and 19 respectively of the chair so as to permitdetachable mounting of the arm assembly 11 to a single chair 13 or toeach of a pair of chairs disposed in side-by-side relation intermediatewhich the arm assembly is supported` The brackets 25 and 27 also providestructural support for, and strengthen the lower end of, the standard-21 so as to prevent relative movement of the tubular membersY about thepin S1.

Mor-e specifically, the bracket 25 Vis ahixed to the innermost side ofthe standard so as to be adjacent to and engageable with the bracket 17of a 'first seating unit 13a when the Iarm assembly 11 is disposed inthe desired position adjacent the seating unit {lt-TIG. 1). The bracket25 is identical to the bracket 19 and, hence, is capable of interlockingengagement with the bracket 17, thereby detachably securing the tabletarm assembly to the seating unit. 'In this regard, the bracket 25includes a pair of inwardly facing tongues 91 which are adapted to bereceived in the grooves 63 of the bracket 17 when the arm assembly islowered or moved vertically downwardly relative lto the bracket 17. Suchdownward movement is halted by the interengagement of the upwardly anddownwardly lfacing surfaces of the channels and tongues respectively,thus providing vertical support for the assembly 11. Lateral support forthe assembly is provided by the iuterengaging vertically disposedhorizontally spaced surfaces of the brackets, thereby preventing orgreatly limiting lateral wobbling mov-ement of the assembly.

The bracket 27 is aiixed to the opposite or outer side of the standard21 and is therefore engageable with the bracket 19 of al second seatingunit 13b disposed adjacent the iirst seating unit 13a on which the armassembly is mounted. The bracket 27 is identical to the bracket 17 and,hence, is capable of interlocking engagement with the bracket 19,thereby detachably securing the arm assembly 11 to the second seatingunit and, hence, securing the first and second seating units to oneanother. In this regard, the bracket 27 is provided with a pair ofoppositely facing channel sections 93 defining upwardly converginggrooves 95 which are adapted to receive the tongues '71 of the bracket19 when the bracket 19 is lowered or moved downwardly relative to thebracket 27. The engagement of the arm assembly by a bracket 19 of anadjacent chair provides additional structural support for the assembly.

Accordingly, it should be apparent that the tablet arm assembly can, byvertical movement, be attached to or detached from a first seating unit13a when the bracket 25 and 17 are placed in, or removed from,interlocking engagement with one another, and may have a second seatingunit 13b attached to or detached from it, thereby detachably securing apair of the seating units to each other.

In order to ensure the sturdy support of the arm assembly 11 adjacent aseating unit 13a, particularly when the assembly is not receivingadditional support from a second seating unit 13b, as well as to hinderthe unauthorized detachment of the arm assembly, the brace S3 isprovided and comprises a short tubular member (FIGS. 3 and 6) flat-tenedat one end to provide a vertically disposed portion 97 which, aspreviously mentioned, is posi` tioned intermediate the tubular members77 and 79 of the standard 21. The tubular member of the brace isflattened at its opposite end to provide a horizontally disposed portion99 which is provided with a hole to enable it to be fastened to one ofthe strips 45 aiixed to the bight portion 41 of the leg members 35 and37. In addition, a second hole isprovided at approximately themid-portion of the brace to receive a bolt 101 from which is suspended aclamping plate 103 (FGS. 3 and 6). The clamping plate 103 is adapted toengage the lower surfaces of the bight portions 41 of the leg members 35and 37and, accordingly is preferably provided with a pair ofspaced-apart arcuate recesses (not shown).

In the'attachment of the arm assembly 11 to theseating unit 13, theoutwardly extending end portion of the brace 83 is positionedintermediate the bight portions d1 of the leg members, withthe'clampingplate 103 disposed in parallel relation to the brace, andwith the liattened end portion 97 of the brace disposed in partiallyunderlying relation to the strip 45. As the arm assembly is lowered tobring the brackets 17 and 25 into engagement with one another, the braceis pivoted slightly to bring its flattened end 99 into contact with theunder surface of the strip 4S. The brace is then secured to the strip 45by a suitable fastener 195 passing through the strip 45 and end portion99 of the brace, and the clamping plate is rotated to the position shownin FIGURE 6, after which a nut 106 of the bolt 101 is tightened to clampthe plate to the bight portions 41.

The tablet arm 23, carried on the upper end of the standard 21, may beof any conventional design but, as illustrated, comprises an elongatedfiat board having an enlarged forward por-tion 107 defining a supportingsurface for receiving books, writing materials, etc., and a rearwardlyextending narrow neck portion 109 located along the right side of thetablet arm which is disposed farthest from the shell 14 and serves as anarm rest. The tablet arm may be formed of any rigid material, but ispreferably formed of wood.

The rearward end of the neck por-tion 109 of the tablet arm is pivotallysecured to the standard by means of a clip 111 aiixed to the undersideof the neck and defining, with the tablet arm, a generally circularbearing cavity which receives the rearwardly directed horizontallydisposed upper end portion of the tubular member 79 of the standard. Thecurvature of the rearwardly directed portion 89 is such that the clip111 is unable to slide forwardly therealong and, hence, forward shiftingof the tablet arm is prevented. Rearward shifting of the tablet arm isprevented by the pivotal interconnection of the forward portion of thetablet arm and the forwardly directed upper portion 37 of the tubularmember 77 of the standard, as hereinafter described.

More specifically, the enlarged portion of the tablet arm has agenerally L-shaped tube 113 secured by suitable fasteners 115 to itsunder-surface and includes an arm 117 extending generally parallel tothe side edges of the tablet arm and a leg 119 extending generallytransversely to the side edges.

The rearward end of the arm 117 is rotatably connected to the forwardend of the horizontally disposed arm portion of the standard so as topermit the arm to be moved between a generally horizontal position, asshown in full lines in FIGURE 5, and an upright position as shown indotted lines in FIGURE 5, the latter position facilitating ingress toand egress from the shell 14.

More specifically, the forwardly extending horizontally disposed endportion 87 of the tubular member 77 of the standard is formed to definea hollow cylindrical cavity having disposed therein a cylindricalbearing member 121 which is keyed against rotation within the cavity bya pair of pins or dowels 123 and extends outwardly of the cavity. Theouter end of this extending portion of the bearing member 121 is formedto provide a projecting semi-cylindrical segment 125 having a generallyvertically disposed laterally directed face 127.

The forwardly extending portion of the bearing member defines an axisabout which the L-shaped tubular member 113 rotates and, in this regard,is received Within a cavity defined by the rearwardly extending ar-m 117of the member 113. A plug 129 is disposed inwardly of the cavity of thearm and is keyed thereto by suitable pins or dowels 131. The rearwardlyfacing end of the plug is disposed adjacent the forward end of thebearing member 121 and is formed to provide a rearwardly projecting stud133 of pie-shaped or quarter-round configuration adapted to cooperatewith the semi-cylindrical segment 125 of the plug 121 to limitrotational movement of the tablet arm.

More specifically, and with reference to FIGURE 9, it will be seen thatinterengagement between the face 127 of the semi-cylindrical forwardlyprojecting segment 125 of the bearing member 121 and the faces of thepieshaped stud 133 of the plug 129 limits the rotation of the L-shapedtubular member 113 and, hence, of the tablet arm 23, to approximatelyone quarter turn, thereby permitting the tablet arm to assume either ahorizontal or an upright position. It has been found preferable to formthe pie-shaped stud 133 so that the included angle thereof is slightlygreater than thereby placing the tablet arm at slight angles to thevertical and horizontal in each of the respective positions.

An improved seating arrangement has thus been provided which includes anarm assembly which can be detachably mounted on a single seating unit,or which can be disposed intermediate and attached to each of a pair ofside-by-side units, in which case the arm assembly serves tointerconnect the units to each other.

While various structural features of the invention have been shown anddescribed with respect to one specific embodiment thereof, it should beapparent that Various modifications might be made therein withoutdeparting from the scope of the invention.

What is claimed is:

l. An arm assembly adapted to be detachably mounted adjacent one side ofa seating unit to which a bracket yis iixedly secured, said arm assemblycomprising a standard having affixed thereto a bracket adapted forinterlocking engagement with the bracket of the seating unit, saidbrackets being so formed that engagement therebetween is effective torigidly secure said arm assembly to the seating unit, and an arm membercarried on said standard.

2. An arm assembly adapted to be detachably mounted intermediate a pairof seating units arranged in side-byside relation and having a bracketaffixed to each of the adjacent sides thereof, said arm assemblycomprising a standard having a bracket affixed to each of its oppositesides, each of said standard brackets being adapted for interlockingengagement with a complementary bracket of one of the seating units soas to detachably secure said arm assembly to each of the seating unitsand interconnect the seating units with each other, and an arm membercarried on said standard.

3. An arm assembly adapted to be detachably mounted adjacent one side ofa seating unit provided with a bracket, said arm assembly comprising astandard provided with a complementary bracket adapted for interlockingengagement with the bracket of the seating unit so as to detachablysecure said arm assembly to the seating unit, said bracket of said armassembly including horizontally spaced laterally facing surfaces adaptedto cooperate with similarly disposed surfaces on the bracket of thechair to limit lateral movement of said arm assembly in the interlockingposition, said bracket of said arm assembly also including a downwardlyfacing surface adapted to cooperate with an upwardly facing surface onthe bracket of the chair to limit downward vertical movement of said armassembly when in the interlocking position whereby said arm assembly maybe lowered vertically into or raised vertically out of mountingengagement with the chair, and an arm member carried on said standard.

4. A tablet arm assembly adapted to be detachably mounted adjacent oneside of a seating unit provided with a bracket, said tablet arm assemblycomprising an upright standard, a complementary bracket secured to saidstandard and adapted for interlocking engagement with the bracket of theseating unit so as to detachably secure said tablet arm assembly to theseating unit, said standard including an outwardly extending generallyhorizontal member, a tablet arm disposed adjacent the upper end of saidstandard, and means for pivotally connecting said tablet arm to saidstandard comprising a support member secured to the under surface ofsaid tablet arm in coaxial relation with the member of said standard, abearing extending from one of said horizontal and support members in thedirection of the other member, tbe other of said members defining acavity at one'end to receive said bearing', a plug i'lxedly securedwithin said cavity'and including an end disposed adjacent the inwardlyextending end of said bearing, said adjacent ends Of said bearing andsaid plug being provided with meshing projections to limit rotation ofsaid support member and, hence, of said tablet arm to a predeterminedincluded angle.

5. A seating arrangement comprising a seating unit having a bracketallixed adjacent one side thereof, and an arm assembly detachablymounted on said seating unit, said arm assembly comprising a standard, abracket atxed to said standard and interlockingly engaged with saidbracket of said seating unit, said brackets being so formed thatengagement therebetween is effective to rigidly secure said arm assemblyto the seating unit, and an arm member carried on said standard.

Y 6. A seating arrangement comprising a seating unit, a bracket securedto said seating unit and dening a pair of horizontally spaced'laterallyfacingy surfaces and an upwardly facing surface, andan arm assemblydetachably mounted on said seating unit, said arm assembly comprising astandard, a bracket secured to said standard, said bracket defining apair of horizontally spaced laterally facing surfaces and a downwardlyfacing surface in engagement with said laterally and upwardly facingsurfaces respectively deiined by said bracket secured to said seatingunit, and an arm member carried on said standard.

7. A seating arrangement comprising` a seating unit, a bracket securedto said seating unit, said bracket including a pair of channels deiiningupwardly converging grooves, and an arm assembly detachably mounted onsaid seating unit, said arm assembly comprising a standard, a bracketsecuredto said standard, said bracket including a pair of upwardlyconverging tongues disposed within the said grooves defined by saidbracket of said seating unit, and an arm member carried on saidstandard.

8. A seating arrangement comprising a seating unit provided with abracket, and a tablet arm assembly detachably mounted on said seatingunit, said tablet arm assembly comprising a standard, a bracket securedto said standard and interlockingly engaged with said bracket or' saidseating unit, said standard including an outwardly extending generallyhorizontal member, a tablet arm disposed adjacent the upper end of saidstandard, and means for pivotally connecting said tablet arm to saidstandard comprising a support member secured to the under surace yofsaid tablet arm in coaxial relation with the member of said standard, abearing member extending from one of said horizontal and support membersinthe direction othe other member, the other of said members defining acavity at one end to receive said bearing, a plug xedly secured withinsaid cavity and including an end disposed adjacent the inwardlyextending end of said bearing, said adjacent ends of said bearing andsaid plug being provided with meshing projections to limit rotation ofsaid support member and, hence, oli said tablet arm to a predeterminedincluded angle.

9. A seating arrangement comprising a pair of seating units disposed inside-by-side relation, a rst and a second bracket secured to cach ofopposite sides of each of said seating units, said rst bracket includinga pair ot channels defining upwardly converging bracket including a pairof upwardly converging tongues, and an arm assembly disposedintermediate said seating units and detachably secured to each so as todetachably secure said seating units to each other, said arm assemblycomprising a standard, a rst and a second bracket secured to oppositesides of said standard and interlockingly engaged with a bracket `of oneof said side-by-side seating units, said lirst bracket including a pairof upwardly converging tongues disposed within the said upwardlyconverging grooves of said rst bracket of said seating unit and saidsecond bracket including a pair of channels deiining upwardly converginggrooves having disposed therein the tongues of said second bracket ofsaid seating unit, and an arm member carried on said standard.

it). A seating arrangement comprising a pair of seating units disposedin side-by-side relation, a bracket secured to each of opposite sides ofeach of said seating units, one of said brackets dening a pair ofhorizontally spaced laterally facing surfaces and a downwardly facingsurface, and an arm assembly disposed intermediate said seating unitsand detachably secured to each so as to detachably secure said seatingunits to each other, said arm assembly comprising a standard, a bracketsecured to each of opposite sides of said standard and interlockinglyengaged with a bracket of one of said side-by-side seating units, one ofsaid brackets defining a pair of horizontally spaced laterally facingsurfaces and a downwardly facing surface in engagement with saidlaterally and upwardly facing surfaces respectively dened by said onebracket of said seating unit, and an arm member carried on saidstandard.

ll. A seating arrangement comprising a pair of seating units disposed inside-by-side relation, a bracket secured to each of opposite sides ofeach of said seating units, one or said brackets including a pair oi'channels deiining upwardly converging grooves and the other of saidbrackets including a pair of upwardly converging tongues, and an armassembly disposed intermediate said seating units and detachably securedto each so as to detachably secure said seating units to each other,said arm assembly comprising a standard, a bracket secured to each ofopposite sides of said standard and interlockingly engaged with abracket of one of said side-by-side seating units, one of said bracketsincluding a pair of upwardly converging tongues disposed within the saidupwardly converging grooves of said one bracket of said seating unit andthe other of said brackets including a pair of channels definingupwardly converging grooves having disposed therein the tongues of saidother bracket of said seating unit, and an arm member carried on saidstandard.

References Cited by the Examiner UNTED STATES `PATENTS 3,684,977 4/ 63Chapman 297-239 3,095,236 6/63 Klassen 297-162 FOREIGN PATENTS 822,16212/37 France.

560,270 9/57 Belgium.

806,377 12/58 Great Britain. 1,062,407 7/59 Germany.

862,789 3/6l Great Britain.

FRANK B. SHERRY, Primary Examiner.

grooves and said second

1. AN ARM ASSEMBLY ADAPTED TO BE DETACHABLY MOUNTED ADJACENT ONE SIDE OFA SEATING UNIT TO WHICH A BRACKET IS FIXEDLY SECURED, SAID ARM ASSEMBLYCOMPRISING A STANDARD HAVING AFFIXED THERETO A BRACKET ADAPTED FORINTERLOCKING ENGAGEMENT WITH THE BRACKET OF THE SEALING UNIT, SAIDBRACKETS BEING SO FORMED THAT ENGAGEMENT THEREBETWEEN IS EFFECTIVE TORIGIDLY SECURE SAID ARM ASSEMBLY TO THE SEATING UNIT, AND AN ARM MEMBERCARRIED ON SAID STANDARD.